Thanks, this problem started at the end of last year while riding in 70 degree temps and i have not had it out yet this year... Another thing is when i am out riding hard with the boys it does it much more often, and when i have the girlfriend on the back and am riding easy it doesnt seem to happen as much?!? I have a M4 full system with a power commander and velocity stacks... The only thing i have done so far is replace my spark plugs and obviously it did not help. i appreciate all the help!!